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Delay-Tolerant Networks (DTNs) enable routing when mobile nodes are sparsely populated and connect only intermittently. These include networks that attempt to survive large-scale natural disasters, sensor deployments for ecological monitoring, ocean sensor networks, and vehicular networks supported by wireless meshes.
At UMass Amherst we have focused on designing, building, and deploying large-scale DTN systems and protocols. We have deployed a 40-node DTN operating on a public transit system, called DieselNet. We are expanding this deployment to include ad hoc vehicular nodes, such as safety workers, and a Town-wide wireless mesh network. Furthermore, we are deploying our DTN technology in monitoring system for endangered turtles in western Massachusetts. In this talk, we will discuss our DTN deployment experience and two technical contributions: novel, utility-based routing protocols and adding capacity to the network with energy-efficient devices we call throwboxes.